# Copyright (C) 2019-2020 Zilliz. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software distributed under the License
# is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
# or implied. See the License for the specific language governing
# permissions and limitations under the License.


from enum import Enum
import numpy as np


class FieldDecayFunction(Enum):
    LINEAR = 'linear'


def decay_helper(decay_function_mode: FieldDecayFunction):
    def linear(number, max, min):
        return list(np.linspace(max, min, number))

    helper = {FieldDecayFunction.LINEAR: linear}
    return helper[decay_function_mode]
